Cohasset · Leak Detection
A water bill that keeps climbing, a ceiling stain, or a meter that spins with every tap closed in Cohasset? Get connected with an independent plumber who tracks down hidden leaks.
Cohasset, Massachusetts
Cohasset's town water doesn't come from a regional pipeline. It comes from Lily Pond, the Aaron River Reservoir, and the Ellms Meadow wellfield, and in dry summers that local supply gets tight. On July 1, 2026 the Water Department declared a Drought Watch, which it eased to a Drought Advisory on August 1 while asking customers to water lawns only on an odd-even schedule. A leak running inside a wall wastes water the whole town is trying to save, and it shows up on your bill.
The town's housing adds to the risk. Census estimates count about 910 Cohasset homes, roughly 28% of the total, as built in 1939 or earlier. Old galvanized pipe, aging copper, and joints between original and replacement piping are the places hidden leaks tend to start.
Calling or sending a request connects you with an independent plumber who finds and repairs leaks in Cohasset. We're a referral service, so the plumber you reach handles the testing, repair, and pricing.
Close every tap and watch the meter for a few minutes. If its dial or leak indicator keeps turning, water is escaping somewhere.
Compare this bill with the same period last year. A jump with no change in household use deserves a closer look.
Discoloration on ceilings below bathrooms, blistered paint, or spongy flooring near fixtures usually means water has been leaking a while.
A persistent damp odor where pipes run, such as under sinks or in closets backing onto a bathroom, often comes before any visible stain.
Local knowledge
What the town's water systems say about leaks, supply, and the pipes coming into your house.
2026 Drought Steps
The Water Department issued a Drought Watch on July 1, 2026 and downgraded it to a Drought Advisory on August 1, asking for odd-even lawn watering. A leak you fix, inside or at an outdoor spigot, saves water when the town's ponds and wellfield are under strain.
Source: Town of Cohasset news
North Cohasset Ban
On June 16, 2026 the Weir River Water System issued a total outdoor water ban for Hingham, Hull, and North Cohasset, citing low tank reserves from overconsumption and drought. If your water comes from Weir River, a running toilet or dripping irrigation line is worth tracking down quickly.
Source: Weir River Water System
Lead Line Records
The Water Department posted its lead service line inventory as of December 2025, according to its page archived in February 2026. If a plumber is opening up the incoming water line to fix a leak, check that record for your address first so you know what the pipe is made of.
Source: Cohasset Water Department (archived page, February 2026)
Right now
A little detective work helps the plumber narrow the search.
If water is dripping into a light fixture or near outlets, keep away and don't touch switches in that area. Call 911 if wiring is sparking or smoking.
With all fixtures off, check whether the meter moves. Then close the main and watch again; if it still moves, the leak may be on the service line outside.
Put a few drops of food coloring in each toilet tank and wait without flushing. If tinted water reaches the bowl, the flapper is letting tank water slip through.
Take dated pictures of any stain so you and the plumber can tell whether it's growing.
What to expect
The plumber will usually start with the meter and fixtures, then use tools like moisture meters, thermal cameras, acoustic listening devices, or pressure tests to pinpoint the leak before opening walls. In older Cohasset houses with plaster walls and mixed pipe materials, finding the spot first keeps the repair opening small.
Once the leak is found, the plumber may repair a section, replace a fitting, or recommend repiping if the pipes are failing in several places. Plumbing repairs that need a permit go through Building & Inspections at Town Hall; its archived February 2026 page said permits are filed online.
If the leak is on the service line between the meter and the street, the plumber may point you to your water supplier, which depends on whether you're served by the town, Aquarion, or the Weir River Water System.
Hire smart
Plumbing and gas fitting in Massachusetts require a license from the Board of State Examiners of Plumbers and Gas Fitters, and most plumbing work needs a permit from the town's plumbing inspector.
Ask for the plumber's license number and check it on the state's occupational license search before work begins.
A plumber who explains their detection method can usually tell you how much wall or floor might need opening.
Ask whether the leak is a one-off or a sign that more of the house's piping is near the end of its life.
Have the leak repair and any wall or ceiling patching written up as separate lines.
Costs
Cost depends on how hard the leak is to find and reach. A dripping fitting under a sink is quick; a pinhole in a pipe behind plaster or under a slab takes specialized equipment and more time. Older homes with mixed pipe materials can need more than one repair.
Ask whether the quote covers detection alone or detection and repair, how wall openings will be handled, and whether patching is included. If repiping is suggested, get a written estimate and consider a second one before deciding.
More help in Cohasset
Every page below is written for Cohasset homes. Or start from the Cohasset plumbing guide.
Learning Center
A short list of the right questions tells you more about a plumber than any ad. Use these on the phone, during the site visit, and before you sign off on an estimate.
Read the guide
Massachusetts has some of the clearest plumbing rules in the country. Here is how to use them to pick a plumber with confidence, whether the job is a dripping shutoff or a full repipe.
Read the guideQuestions
Still not sure? Send a short request and a local pro can answer the specifics.
The town Water Department draws from Lily Pond, the Aaron River Reservoir, and the Ellms Meadow wellfield off James Lane. Because it's a local supply, dry summers can lead to restrictions, as with the July 2026 Drought Watch. Part of town, including North Cohasset, is served by other suppliers.
The Water Department posted a lead service line inventory as of December 2025. Check that record for your address or ask the department, and have a plumber look at where the water line enters the basement. Don't sand or cut a pipe you think might be lead.
Restrictions like the 2026 odd-even watering schedule apply to outdoor use, but any leak wastes the same supply. Fixing it quickly lowers your bill and helps during dry spells.
Contact your water supplier first to find out where its responsibility ends. A plumber can repair the part on your side, and work at the main may need a drainlayer on the town's posted list.
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